Exam 4: The Normal Curve and Z Score

The normal curve is

Under the normal curve, the percentage of cases falling above a z score of + 3, is

Whenever a given raw score coincides exactly with the mean, the resulting z score, regardless of the size of the standard deviation, must be

Regardless of the size of the raw score mean of standard deviation, a z score of +1 always means that the raw score is exactly one, full standard deviation unit about the mean.

The mean weight among a group of female high school seniors is 120 lbs., with a standard deviation of 16.49 lbs. Assuming a normal distribution, find the percentiles for the following weight scores -25 lbs.

A frequency distribution curve may be symmetrical without being normal.

Under the normal curve, if the mean of the distribution of raw scores is equal to 68, then its equivalent z score is equal to

Under the normal curve, between z scores of + 10, there are always

The percentage values on the z score table are only valid when

A bimodal distribution may never be

Percentage of scores falling between z's of .50 and 1.25

Find the percentage of cases falling between z scores of + .80 and -.80..

Percentage of scores falling between z's of -.80 and -2.00

A percentile of greater than 50 may only occur when the mean of the raw score distribution is greater than 50.

Raw scores may never be converted into z scores unless the raw score mean is equal to 0.

Percentage of scores falling between a z of 1.54 and the mean

Percentage of scores falling above a z of 1.44

Find the percentiles for the following: the mean score on a test of psychopathy among a group of incarcerated inmates is 50, with a standard deviation of 10. Assume a normal distribution, and find the Percentile for the following psychopathy scores: -55

Under the normal curve the 50th percentile always falls at the

There are more cases which fall above a z score of +2 than there are falling below it.